176 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
shire County have been prepared hy cflitin^ the excellent keys in 
Gray's Manual, seventh edition. 
It remains for the writer to express his sincere thanks to those who 
have generously helped in the preparation of the list both in the field 
and in the study. The assistance freely given hy Prof. M. L. Fernald 
in the early years of the undertaking was of the greatest serxice to the 
writer. Dr. Harold St. John has kindly read the manuscript and has 
helped with many difficulties. Mr. C A. Weatherby has generously 
given aid and advice. Mrs. Agnes Chase, Mr. W. W. Eggleston, 
Mr. F. F. Forbes, Mr. F. Tracy Hubbard, Mr. Bayard Long, Mr. K. K. 
Mackenzie, and Prof. K. M. Wiegand have very kindly aided in 
determining difficult species. Dr. B. L. Robinson and Miss M. Day 
have been frequently consulted. Without the keen eyes and industry 
of Mr. F. Walters and Judge J. R. Churchill the list would be poorer 
by a number of species. Mr. Walters has also been of great help in 
the study of Dewey's and Eaton's nomenclature. The map of Berk- 
shire County has been kindly drawn by Mr. H. Harris. The writer 
wishes to take this opportunity to express his gratitude to Mr. and 
Mrs. Bernhard Hoffmann for the constant interest which they have 
shown in the preparation of the list. 
